Climate changes and solar cycles recorded at the Holocene Paraná Delta, and their impact on human population | Land Portal | Securing Land Rights Through Open Data

Resource information

Date of publication: 
January 2017
Resource Language: 
ISBN / Resource ID: 
LaReferencia:AR_ec66cbc70362d62ea4ce610b6cbc26d8
Copyright details: 
info:eu-repo/semantics/openAccess : Open Access, this refers to access without restrictions, and without financial incentives. Access to the resource is gained directly, without any obstacles.

The Paraná delta, growing at a rate of c. 2 km2 yr-1 since 6,000 yrs, is one of the most complete record of late Holocene in southern South America. The evolution of this 17,400 km2 delta enclosed in Plata estuary, can be tracked by a series of 343 successive coastal-ridge showing a c.11 years period, in coincidence with sunspot cycle, also found in some North Hemisphere coastal-ridge successions. The Paraná delta shifted from fluvial, to wave-dominated, and back to the present fluvial dominated delta, in response to climate changes associated with wind activity correlating with South American glacial cycles. The wave-dominated windy period coincides with activation of the Pampean Sand Sea, suggesting desert conditions prevailed on the Pampas between 5,300 and 1,700 yrs, in coincidence with scarce or absent pre-historic aborigine remains (?archeological silence?). Further warmer and less windy conditions allowed human repopulation. Results suggest that aside the solar forcing, both short and medium term climate changes controlled delta evolution. An important learning is that a slight cooling would turn the highly productive pampas, into that unproductive desert and, given the lack of artificial irrigation systems, changing present-day warmhouse into a cooling cycle might be economically catastrophic for the region.

Authors and Publishers

Author(s), editor(s), contributor(s): 
Milana, Juan Pablo Krohling, Daniela Mariel Ines

Data provider

The Federated Network of Institutional Repositories of Scientific Publications (Red Federada de Repositorios Institucionales de Publicaciones Científicas), or simply LA Referencia, is a Latin American network of open access repositories. Through its services, it supports national Open Access strategies in Latin America through a platform with interoperability standards, sharing and giving visibility to the scientific production generated in institutions of higher education and scientific research.

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